You need to edit the .rms file to ensure the terrain constraints are set correctly for the Paper (Gold/Silver visual replacement) objects. Sinhala Wela Video Fixed Here
If you meant a different specific unit or mechanic (like the "Paper" unit in a strategy game like Battle of Polytopia, or "Paper" money in a specific mod), please clarify so I can give you the exact strategy guide! Download Lalbaug Parel 2010 Marathi - 3.79.94.248